There are several resources to find information about Chopkjas releases:
http://pacoweb.net/cgi-bin/CDsearch.pl (enter Chopkjas in the Artista field)
however, some of the information is contradictory regarding track order, suggesting many releases of the same album (or different track order in different formats?)
For albums that aren't available on iTunes, I've chosen to enter only what can be found in scans of tracklists, if any are available ("Amándote en Silencio"'s only accessible tracklist seems to be the one on melodiasdelande).
Note that many of these release groups have much earlier releases that have not been entered here yet -- I'm largely referring to the scans provided on the blogspot site, which seem to be for digitized reissues created in the mid-2000s, when the albums originally date from the mid-1990s. I don't understand enough of the websites to determine what information belongs to which version; I'll leave someone else to work out the original dates and tracklists of the original versions.
Also note that there are songwriting and performer credits available in many of the scans which I have not yet transcribed into MusicBrainz.